want to setup my 5D2 for reasonably decent quickie slide copying (have high end film scanner but just too slow), tried fixed focal length lenses on extension tubes but field curvature was a killer. Want to look now at a 1:1 macro either 60mm or 100mm, possibly Zeiss-Contax or Canon. Anyone know of issues with either for field curvature or perspective distortion to copy slides with the two focal lengths?
Thx for the info.